Tests null handling of several HTMLButtonElement attributes

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS button.getAttribute('formMethod') is null
PASS button.getAttribute('formEnctype') is null
PASS button.getAttribute('type') is null
button.formMethod = null
PASS button.getAttribute('formMethod') is "null"
button.formEnctype = null
PASS button.getAttribute('formEnctype') is "null"
button.type = null
PASS button.getAttribute('type') is "null"
PASS successfullyParsed is true

TEST COMPLETE